Cross-carrier scheduling with multiple active bandwidth parts

Patent metadata

Field	Value
Publication number	US-11109397-B2
Application number	US-201916415046-A
Country	US
Kind code	B2
Filing date	May 17, 2019
Priority date	May 18, 2018
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

Wireless communications using multiple active resources (e.g., bandwidth parts (BWP)) are described. At least one of multiple active resources (e.g., BWPs) of a first cell may be selected to send scheduling information (e.g., cross-carrier scheduling information) for other cells. A base station may send downlink control information (DCI) for scheduling (e.g., cross-carrier scheduling) a second cell using the selected BWP. A wireless device may monitor a physical downlink control channel (PDCCH) of the selected BWP to detect the DCI for scheduling (e.g., cross-carrier scheduling) the second cell.

First claim

What is claimed is:

1. A method comprising:
receiving, by a wireless device, configuration parameters that indicate cross-carrier scheduling of a second cell via a first cell;
activating at least two bandwidth parts (BWPs) for the first cell;
determining a first BWP, of the at least two BWPs, to monitor for cross-carrier scheduling of the second cell;
monitoring, on the first BWP during a time period in which the at least two BWPs are both active, a downlink control channel for cross-carrier scheduling of the second cell; and
receiving, via the first BWP during the monitoring, downlink control information (DCI) that indicates radio resources for the second cell.

2. The method of claim 1 , wherein the determining the first BWP is based on BWP indexes of the at least two BWPs.

3. The method of claim 1 , wherein:
the first BWP is a primary BWP;
a second BWP of the at least two BWPs is a secondary BWP; and
the determining the first BWP is based on the first BWP being the primary BWP.

4. The method of claim 1 , further comprising at least one of:
receiving, via downlink radio resources of the radio resources for the second cell, a downlink transport block; or
sending, via uplink radio resources of the radio resources for the second cell, an uplink transport block.

5. The method of claim 1 , further comprising:
switching from the first BWP to a third BWP of the first cell as an active BWP;
based on the switching:
monitoring, on the third BWP during a time period in which the third BWP and a second BWP of the at least two BWPs are both active, a downlink control channel for cross-carrier scheduling of the second cell; and

receiving, via the third BWP during the monitoring, second DCI that indicates second radio resources for the second cell.

6. The method of claim 1 , wherein the configuration parameters further indicate at least one of:
a control resource set of the first BWP;
a search space set of the first BWP;
a subcarrier space of the first BWP;
a quantity of symbols of the first BWP; or
a set of resource blocks of the first BWP.

7. The method of claim 1 , wherein the activating the at least two BWPs for the first cell comprises:
activating the first BWP during a first time interval; and
activating a second BWP of the at least two BWPs during a second time interval, wherein the second time interval at least partially overlaps with the first time interval.

8. The method of claim 1 , wherein the DCI comprises:
a cell index indicating the second cell; and
a BWP indicator indicating at least one of:
an uplink active BWP of the second cell; or
a downlink active BWP of the second cell.

9. A method comprising:
activating, by a wireless device, a first bandwidth part (BWP) of a first cell as a primary BWP;
activating a second BWP of the first cell as a secondary BWP;
monitoring, on the primary BWP, a downlink control channel for cross-carrier scheduling of a second cell;
receiving, during the monitoring, downlink control information (DCI) that indicates radio resources of the second cell; and
based on the DCI, performing one or more of the following:
receiving, via downlink radio resources of the radio resources for the second cell, a downlink transport block; or
sending, via uplink radio resources of the radio resources for the second cell, an uplink transport block.

10. The method of claim 9 , further comprising:
receiving configuration parameters that indicate cross-carrier scheduling of the second cell via the first cell.

11. The method of claim 9 , further comprising receiving configuration parameters that indicate at least one of:
a control resource set of the first BWP;
a search space set of the first BWP;
a subcarrier space of the first BWP;
a quantity of symbols of the first BWP; or
a set of resource blocks of the first BWP.

12. The method of claim 9 , further comprising:
switching from the first BWP to a third BWP of the first cell as an active BWP;
based on the switching:
monitoring, on the third BWP during a time period in which the second BWP and the third BWP are both active, a downlink control channel for cross-carrier scheduling of the second cell; and

receiving, via the third BWP during the monitoring, second DCI that indicates radio resources for the second cell.

13. The method of claim 9 , further comprising:
selecting the first BWP, from at least two BWPs comprising the first BWP and the second BWP, as the primary BWP for the monitoring the downlink control channel for cross-carrier scheduling of the second cell.

14. The method of claim 13 , wherein the selecting the first BWP as the primary BWP is based on at least one of:
BWP indexes of the at least two BWPs; or
the first BWP being the primary BWP.

15. The method of claim 9 , wherein:
the activating the first BWP comprises activating the first BWP during a first time interval; and
the activating the second BWP comprises activating the second BWP during a second time interval that at least partially overlaps with the first time interval.

16. A method comprising:
activating a first BWP of a first cell as a first active BWP;
activating a second BWP of the first cell as a second active BWP;
receiving, via the first BWP, first downlink control information (DCI) for cross-carrier scheduling of a second cell;
switching from the first BWP to a third BWP of the first cell as the first active BWP;
based on the switching:
monitoring, on the third BWP during a time period in which the second BWP and the third BWP are both active, a downlink control channel for cross-carrier scheduling of the second cell; and
receiving, via the third BWP during the monitoring, second DCI that indicates radio resources for the second cell.

17. The method of claim 16 , further comprising:
receiving configuration parameters that indicate cross-carrier scheduling of the second cell via the first cell.

18. The method of claim 16 , further comprising receiving configuration parameters that indicate at least one of:
a control resource set of the first BWP;
a search space set of the first BWP;
a subcarrier space of the first BWP;
a quantity of symbols of the first BWP; or
a set of resource blocks of the first BWP.

19. The method of claim 16 , further comprising:
selecting the third BWP, from at least two BWPs comprising the third BWP and the second BWP, as an active BWP for the monitoring the downlink control channel for cross-carrier scheduling of the second cell, wherein the selecting the third BWP is based on at least one of:
BWP indexes of the at least two BWPs; or
the third BWP being a primary BWP.

20. The method of claim 16 , wherein:
the activating the first BWP comprises activating the first BWP during a first time interval; and
the activating the second BWP comprises activating the second BWP during a second time interval that at least partially overlaps with the first time interval.

Assignees

• Comcast Cable Comm Llc

Inventors

• Zhou Hua
• Dinan Esmael Hejazi
• Cirik Ali
• Babaei Alireza
• Jeon Hyoungsuk
• Park Kyungmin

Classifications

• H04W72/535 Primary

  based on resource usage policies · CPC title

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04L5/0082

  at predetermined intervals · CPC title

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title